Method and apparatus for bottoming bags



\ July 2 7, 1943. H. H. CRAWFORD 2,325,042

\ METHOD AND APPARATUSFOR'BQTTOMING BAGS 3 Sheets-Sheet 1 Filed May 27, 1941 AT TOR NVEYS July 27, 1943. H. H. CRAWFORD 2,325,042

METHOD AND APPARATUS FOR BOTTOMING BAGS Filed May 27, 1941 5 Sheets-Sheet 2 I |-N\/ENT-OR 75 W44 76 I BY 9' (Q4 ATTOR NEY6 1111227, 9 H. H. CRAWFORD 2,325,042

7 METHOD AND APPARATUS FOR BOTTOMING' BAGS Filed May 27, 1941 3Sheets-Sheet lNvENToR AT TOF-QNEY-S Pa tented July 27, 1943 METHOD AND APPARATUS-FOR BOTTOMING BAGS Harry B. Crawford, Wellsburg, W. Va., assignor to St. Regis Paper Company, New York, N. Y., a corporation of New York Application May 27, 1941, Serial No. 395,440

9 Claims. (01. 93-23) This invention relates to -'a method and apparatus for bottoming a pasted end bag, particularly where a supplemental sheet is added to the bag end' during the bottoming operation.

More particularly it applies to where the supplemental sheet is formed into a sleeve which constitutes a filling opening which may be readily closed after the bag has been filled.

In my co-pending application Serial No. 310,293, filed December 21, 1939, for Apparatus for applying supplemental members to bag ends, there is disclosed apparatus for applying a supplemental sheet during the bottoming operation to form an inward extension of the valve. In the construction there shown, this may be accomplished without. a separate pasting operation and the bag tube may be fed through the apparatus by opposing belts which grip the edge of the tube. K

The present disclosure is intended for use where a supplemental sheet is employed for a sleeve or otherwise in such a way that it requires 4 a supplemental pasting operation and/or where it extends beyond'or so nearly. to the side of the bag tube that it is not feasible to feed the tube The construction as well as the operation of the mechanism will be described in connection with a description of the successive steps employed in forming the bag closure.

A section of a bag tube Illcollap'sed and having slits 2| as shown at the left of Fig. 11 for dividing theend flaps from the side flaps of a pasted bag end isfed upward between two rollers 22'and 23, roller 22 having means for seizing one side of the bag tube so that it is pulled to the left as it passes upward between the rollers while the. other side flap is fed up beneath finger 24. The roller 22 then releases the side flap at the proper time so that the bagend opened as shown in position B in Fig. 11 is fed to the right beneath roller 25' and over table 26.

A paste trough z'l is provided above table 26 and a, paste roller 28 transfers paste from the trough to a roller 29 which in turn transfers the paste to paste pads 80 carried on ashaft 3|.

. As the bag end moves to the right, it passes over a roller 32 and beneath'the paste pads so that there is applied to the bag end paste 33, as indicated at position C in Fig. 11.

As the bagcontinues to move to the right, its leading end is positioned under a clamping member on a chain conveyor. This conveyor consists of three chains 40, 4i and 42 which pass around sprocket wheels onshafts 43 and 44 and around similar sprocket wheels on a tightener shaft 45. The middle one of these three chains carries a series of clamps 46. The structure of the clamp is shown in detail in Fig. 4. It com prises a clamping member 4'! pivoted on the chain Fig. 3 is a plan view of the chain conveyor shown in Figs. 1 and 2;

Fig. 4 is an isometric view of one of the clamps employed upon the chain conveyor;

Fig. 5 is a cross-section of the chain conveyor taken approximately on line 55 of Fig. 3;

Fig. 6 is a view of a creasing blade with paste pad attached;

drive mechanism at 48 to oscillate to and from a clamping member 49 fixed on the chain.

. A spring 50 normally holds the clamping memher in closing position. An arm 5| projecting from the pivot 48 carries a roller 52 which operates to open the clamp at certain times. As shown in Fig. 2, there is provided a cam 53 which holds the clamp open as it passes around shaft 43, but allows it to close as it passes to the right of that shaft. The apparatusv is timed so that the forward end of the opened and pasted bag end moves over clamping member49 beneath clamping member 41 and-is seized by the clamp when roller 52 runs down cam -53. The bag is then pulled along by the clamp until its full length lies upon the chains.

Above the left hand end of the chains, there is provided a shaft 55 carrying a roll 56 of paper. The strip of paper is fed from th roll between guide rolls 51 and from there between cutter rolls 58 to a segment 59 mounted-upon a shaft cam 99.

.a cam IOI.

type and operates in' the known way to enter 80. Above shaft 60, there is a shaft 5| carrying a roller 62 with an abutment 63. The apparatus is timed so that just as the end of the strip reaches the position in which it is shown in Fig. 2, it will be clamped between segment 59 and abutment 63. Carried upon shaft 60 there is also an arm 64 carrying a shaft 65 which has afixed thereto pin carriers 66, which work through the leading edge of segment 59. By suitable cam mechanism, shaft 65 is rocked so that the pins in pin carrier 66 are operated to puncture the strip of paper as it reaches the position shown in Fig. 2. At the same time, the cutters operate to cut off the strip, leaving a section of the strip attached to segment 59.

A shaft 60 rotates, it carries the section 61 of the paper strip with it, and the apparatus is timed so that this stri is applied by the se ment across the end of the bag as the bag end passes below the .segment in position D, indicated on Fig. 11. About midway above the chains,

there is mounted a shaft I carrying creaser plates II and I2. Creaser plate II has attached thereto a bracket 13, asshown in detail in Figs. 6 and 7. This bracket provides seats for springs 14' which extend plungers I normally to the limit permitted by nuts 15a. 'I'o plungers "I5 there is attached a paste pad I6 which normally is spring pressed slightly below the edge of creasing plate I I.

Above shaft II there is arranged a paste trough 11 from which a roller I8 transfers paste to another roller I9. During the rotation of shaft I0, paste pad I5 comes in contact with roller I9. As shaft I0 continues to rotate the creasers are moved to the position in which they are shown in Fig. 2 and the parts are timed so that a bag end will be positioned beneath the creaser at this point. The pastepad I6 thereupon applies a strip of paste 80 upon the edge of supplemental paper section 61, as shown at position E on Fig. 11. The creasing plates at the same time form creases 8| and 82 in the bag end, which mark the bases of side flaps 83 and 84 and about which side flaps may be folded to complete the formation of the bag end.

Chains 40 and 42 carry pushers 85. These may be of any desired construction, but in the example shown, they are constructed substantially the same as clamps 45. They are spaced from clamps at such a distance that they seize the rear end of the bag.

' to form a closed end with a sleeve through the ably mounted upon the frame. Gear I04 is connected by a link I05 with a lever I06 operated by cam wheel I01 in contact with cam I08 fixed upon the end of shaft 95. The cam is shaped and positioned so that finger 82 is swung downward and to the left from the position in which it is shown in Fig.,2 at th proper time to contact the bag end alon line 82 just as the rear flap folder 90 starts to fold the flap forward into position and the finger 92 is then withdrawn so as to be out of the path of the bag end.

Front flap folder 9| then picks up and folds rearwardly the front flap so asto complete the folding of the bag, as shown at position G in Fig. 11. Since this front flap folder may be of any well known type, it need not be either shown or described in detail.

As the bag end passes from table 86, it is moved onward by rollers H0 and III to any suitable receiving mechanism. Clamps 85 are released as they pass around shaft 44 so as to release the bag and allow its removal.

It will be seen that in the form disclosed, supplemental sheet 61 completely covers the pasted end flap and the paste on side flap 83. When flap 83 is folded forward to the position in which it is shown at F in Fig. 11, there is no paste between the portion of supplemental sheet 61 which is folded over with the flap 83 and the portion of the supplemental sheet lying thereunder. When the front flap ,84 is folded backward to the position in which it is shown at G in Fig. 11, the paste'line 80 secures the edge of supplemental sheet 61 to the top of flap 8! and to the topof the underlying portion of supple mental sheet 81 which extends beyond flap 88. In this way, there is completed a sleeve which extends to the outer edge of sheet 8'! and has an opening therethrough which may be employed for filling the bag. i

What I claim is:

1. The method of closing the end of a bag tube bag to be filled, which consists in opening the end of a-bag tube to form two oppositely disposed outwardly extending side flaps and two inwardly extending end flaps connecting the ends of the side flaps, applying paste to the edges of the end As clamp 46 approaches and rounds shaft II, I

it is cam-operated to open and thereby release the end of the bag so that the bag end moves forward beneath the folding devices. The rear clamps continue to move the bag forward over plate 86. As the fold end of the bag is moved over plate 86, the folding of the side flapsis completed. This is accomplished by a rear flap folder 90, a fold flap folder 9| and a finger 92. The rear flap folder 80 is pivoted at 83 to an arm 94 which is mounted on a shaft 88. Shaft 95'has a crank arm 96 connected by a rod 8!.

to an operating member 88 reciprocated by/"a At the-rear end of the arm-carrying folder 90, there is a wheel I00 which contacts This rear folder is of a well known thereof a gear I03 in mesh with'a gear I04 suitflaps and one of the side flaps, applying-a supplemental sheet to the pasted edge of one end flap so that the sheet extends outward beyond the ends of the side flaps and extends acrossthe base line of the pasted side flap, applying paste tothe edge of the supplementalsheet'that extends across said base line, folding inward the unpasted side flap, and finally folding inward the pasted side flap and thereby uniting the side flaps and the edges of the supplemental sheetl 2. Bag bottoming apparatus comprising an opening device for opening the end of a bag tube, a conveyor in position to receive the opened bag from the opening device, said conveyor comprising three parallel chains, a clamp on the central chain timed to clamp the leading edge of the opened end, flap folders at the delivery end of the conveyor, means to release the clamp before it reaches the folders, and pushers on the side chains in position to engage the rear end of the bag tube and. push it through the folders.

3. Apparatus'in accordance with claim 2 and comprising a pasting device above the receiving end of the chain conveyor and adapted to apply mental sheet to a pasted portion of the opened end. v

4. Apparatus in accordancewith claim 2 and comprising a pasting device above the receiving 'end of the chain conveyorand adapted to apply paste upon the opened end of the bag, means above the chain conveyor for applying a supplemental sheet to a pasted portion of the opened v end, and adapted to position the supplemental comprising means above the chains to apply paste to the opened end of the bag, means above the chains to apply a supplemental sheet to a pasted portion of the opened end, and means above the chain to apply paste to'a portion of the upper side of the supplemental sheet.

6. Apparatus in accordance with claim 2 and comprising means above the chains to apply paste tov the opened end, means to apply a supplemental sheet to a pasted portion of the opened end, and means to crease the opened end along the base line of the side flaps and across the supplemental sheet.

'7. Apparatus in accordance with claim 2 and comprising means above the chains to apply paste to the opened end, means to apply a supplemental sheet to a pasted portion of the opened end, means to crease the opened end along the base line of theside flaps and across the supplemental sheet, and-a paste pad carried by one .of

the creasers in position to apply paste along one edge of the supplemental sheet.

8. The methodot closing the end of a bag tube to form a closed end with a sleeve through the bag to be filled, which consists in opening the ot the has.

end of the bag tube to form two oppositely disposed outwardly extending side flaps and two inwardly extending end flaps connecting the ends of the side flaps, applying paste to the edges of the end flaps, applying a supplemental sheet to I the pasted edge of one end flap so that the sheet extends outward beyond'the ends of the side flaps and extends across the base. lines of the side flaps far enough so that these extensions of the supplemental sheet overlap when the side flaps are folded to close the bag end, applying paste to one edge of the supplemental sheet at least where it extends beyond the end of the side flap, and then folding and adhering together the side flaps to close the end of the bag, the side flaps being folded in the order that brings the pasted side of the supplemental sheet against the side of said overlapping extension of the supplemental sheet, whereby the supplemental sheet forms a complete sleeve where it extends beyond the side flaps.

9. Apparatus for bottoming bags, which comprises means to open the end of a bag tubeand thereby form end flaps and side flaps, means'to apply paste tothe edges of the end flaps and'one side flap, means to apply a supplemental sheet to the pasted edge of one end flap and across the side flaps where they join the end flap, parallel creasers, means to apply the creasers to the open end of the bag after the supplemental sheet has been applied, a paste pad carried by one of the creasers in position to apply paste to one edge of the supplemental sheet, and means to overlap the side flaps .and thereby close the end HARRY H. CRAWFORD. 

